Cannabis leaves turning ligt green

albagrow · Aug 3, 2024

Hello,
I would like get your help.
It's 3rd growing and the same tjing happens this time earlier, im in the end of second week of flowering, some plants turn light green, from last growing they all become like that and larer on they stunt and die.
Im sending you some pics if you had the same problems and you fixed it you can help.
I use plagron fertilizers combined with some aptus, 1000w hps lights.
Thanks

HerbalEdu · Aug 4, 2024

plant on the photo looks rather fine.

but if plant are yelllowing from bottom to top could be nitrogen deficiency, what's weird is you say they get stunt and die so might be ph issue, nutrient lockout, or light stress.

more infos are needed:

growing medium (brand or composition)
watering pratice (how often, what amount and pot size)
Are you monitoring temperature and rh, (things can get out of hand easily with a 1000W HPS )
also some more photos of the plants decaying at different stages from previous grow if you have some ...

albagrow · Aug 4, 2024

Thanks.
I don't think it is nitrogen because all the plant goes light green.
Growing medium is plagron grow mix
Watering is every 3 days at this phase 1l per pot. Pots are 11l and the technique is sog.
There are used les nutes than recommended if plagron terra bloom says max 5ml per 1l, i used 3ml per 1l.
Temperature and rh are under control

Galgrows · Aug 4, 2024

Is there a way to tone down the lights? These plants suck out much of the N during the flowering phase as you've seen. I'm not familiar with your soil, i've heard of it though. Can you top dress with gaia green ?

LoveGrowingIt · Aug 4, 2024

There might be some magnesium deficiency. Adding some Epsom salt to the water would help with that.

That plant looks like it could be sativa dominant. The long, narrow leaflets look like it could be. Sativa is characteristically lighter green in color.

albagrow · Aug 16, 2024

Galgrows said:
Is there a way to tone down the lights? These plants suck out much of the N during the flowering phase as you've seen. I'm not familiar with your soil, i've heard of it though. Can you top dress with gaia green ?

I use plagron grow mix soil. I cant top dress it because i have sog system and i use flooding technique from underneath for watering.

albagrow · Aug 16, 2024

LoveGrowingIt said:
There might be some magnesium deficiency. Adding some Epsom salt to the water would help with that.

That plant looks like it could be sativa dominant. The long, narrow leaflets look like it could be. Sativa is characteristically lighter green in color.

I know, but all plant turns pale green. Normally this strain is more green than in picture it's not my first time growing it.
How much epsom salt should i add? Can it be mixed with other fertilizers on the solution?
During the lights off on the room co2 goes about 3000-4000ppm. I keep co2 to the room to 1000-1100 ppm during lights on.
I see that they dont use much co2 compared to other growing rooms i have grown before.
Here no fresh air enter the same air ricirculate so i can't get rid of co2 they produce during the lights of time.
Do you think they can continue working or should i cut them off.
I entered 5th week of flowering. I see the buds aren't formed as they should be at this phase.

GNick55 · Aug 16, 2024

what nutrients do you have there?
is the plant in a bag or pot?
the co2 is a probably a waste in this situation,.. plants need fresh air..

albagrow · Aug 16, 2024

GNick55 said:
what nutrients do you have there?
is the plant in a bag or pot?
the co2 is a probably a waste in this situation,.. plants need fresh air..

I use plagron nutrients combined with aptus regulator and camg boost.
So terra bloom, power roots, pure zym, green sensation.
Plants are in 11l pot. Lights are dimlux 1000w hps

GNick55 · Aug 16, 2024

albagrow said:
I use plagron nutrients combined with aptus regulator and camg boost.
So terra bloom, power roots, pure zym, green sensation.
Plants are in 11l pot. Lights are dimlux 1000w hps

might be easier to post a pic of the nutrients if you can?

albagrow · Aug 16, 2024

GNick55 said:
might be easier to post a pic of the nutrients if you can?

GNick55 · Aug 19, 2024

ok well i have to look those up,.
is there any NPK ratios on any bottles?

albagrow · Aug 19, 2024

I have been using these nutrients in other growing rooms and i didn't have such problems, here at this room is 3rd time happening.
Terra bloom is 2-4-4
Green sensation is 0-9-10

I talked to plagron specialist and he suggested to use plagron hydro A+B instead of terra bloom.
Hydro A 3-0-1
Hydro B 1-3-6

GNick55 · Aug 19, 2024

albagrow said:
I have been using these nutrients in other growing rooms and i didn't have such problems, here at this room is 3rd time happening.
Terra bloom is 2-4-4
Green sensation is 0-9-10

I talked to plagron specialist and he suggested to use plagron hydro A+B instead of terra bloom.
Hydro A 3-0-1
Hydro B 1-3-6

do go buy labels like bloom grow etc,. it’s all about the NPK ratio..
5 weeks in, though plants are struggling, i’d feed half terra bloom and half hydro A.. once or twice than like hydro A and green sensation for 2 weeks than hydro B till finish kinda thing..
but you have stop watering from the bottom

albagrow · Aug 19, 2024

GNick55 said:
do go buy labels like bloom grow etc,. it’s all about the NPK ratio..
5 weeks in, though plants are struggling, i’d feed half terra bloom and half hydro A.. once or twice than like hydro A and green sensation for 2 weeks than hydro B till finish kinda thing..
but you have stop watering from the bottom

Sounds good but i don't know how they will react to this combination.
Can't water them from the top on this fixture

HerbalEdu · Aug 20, 2024

you need some veg nutrient high in N. plant usually need more N along flowering than what the nurtient brands schedules say

"plagron terra grow" for exemple will complement terra bloom and should be higher in Nitrogen at least N ratio is higher than terra bloom seem terra grow is 3-1-3

so mixing the two you can achieve the ratio you usually want for NPK at different stage.

i think i've read somewhere that your more at risk of salt built up in soil with dedicated hydro nutrient than nutrients dedicated to soil.
Someone may confirm or infirm this.
(so hydro A and B might not be a that good choice despite the nice npk ratio they have)

HerbalEdu · Aug 20, 2024

What is the difference between hydroponic fertilizer and regular fertilizer?

Soil fertilizers rely on bacteria to convert this ammonium and urea to nitrate in a slow process, hydroponic fertilizers do not, they contain nitrate which is the final form of nitrogen that plants prefer for healthy growth.

yeah as there avaialble in there final form and do not need to be processed by the soil bacteria to reach their final form hydro nutrient are not ideal to use in soil, you can but not the best option

the fact bacteria slowly process nutrient in their final form, prevent that there is too much at time.

Cannabis leaves turning ligt green

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